From: John Cai <johncai86@gmail.com>
To: Eric Sunshine <sunshine@sunshineco.com>
Cc: John Cai via GitGitGadget <gitgitgadget@gmail.com>, git@vger.kernel.org
Subject: Re: [PATCH 2/2] diff: teach diff to read gitattribute diff-algorithm
Date: Mon, 06 Feb 2023 08:10:47 -0500 [thread overview]
Message-ID: <52A25839-3564-45D8-AF43-866ADDED983B@gmail.com> (raw)
In-Reply-To: <CAPig+cQNoX1-DN1=aFEX=MxEvoYhdu0NxPyhH++B4_1G2Dmp8w@mail.gmail.com>
Hi Eric,
On 5 Feb 2023, at 12:50, Eric Sunshine wrote:
> On Sat, Feb 4, 2023 at 11:47 PM John Cai via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
>> It can be useful to specify diff algorithms per file type. For example,
>> one may want to use the minimal diff algorithm for .json files, another
>> for .c files, etc.
>>
>> Teach the diff machinery to check attributes for a diff algorithm.
>> Enforce precedence by favoring the command line option, then looking at
>> attributes, then finally the config.
>>
>> To enforce precedence order, set the `xdl_opts_command_line` member
>> during options pasing to indicate the diff algorithm was set via command
>> line args.
>>
>> Signed-off-by: John Cai <johncai86@gmail.com>
>> ---
>> diff --git a/diff.c b/diff.c
>> @@ -3652,6 +3652,27 @@ static void builtin_diff(const char *name_a,
>> + if (!o->xdl_opts_command_line) {
>> + static struct attr_check *check;
>
> `check` is declared static...
>
>> + const char *one_diff_algo;
>> + const char *two_diff_algo;
>> +
>> + check = attr_check_alloc();
>
> ... is allocated here...
>
>> + attr_check_append(check, git_attr("diff-algorithm"));
>> +
>> + git_check_attr(the_repository->index, NULL, one->path, check);
>> + one_diff_algo = check->items[0].value;
>> + git_check_attr(the_repository->index, NULL, two->path, check);
>> + two_diff_algo = check->items[0].value;
>> +
>> + if (!ATTR_UNSET(one_diff_algo) && !ATTR_UNSET(two_diff_algo) &&
>> + !strcmp(one_diff_algo, two_diff_algo))
>> + set_diff_algorithm(o, one_diff_algo);
>> +
>> + attr_check_free(check);
>
> ... and freed here...
>
>> + }
>
> ... so the reason for the `static` declaration is not clear. Am I
> missing something obvious?
No, you are correct. No reason for the static declaration. `check` is not used outside of the scope of this
conditional. I think this made it in from an earlier iteration and I didn't catch the oversight.
thanks
John
next prev parent reply other threads:[~2023-02-06 13:10 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-05 3:46 [PATCH 0/2] Teach diff to honor diff algorithms set through git attributes John Cai via GitGitGadget
2023-02-05 3:46 ` [PATCH 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-06 16:20 ` Phillip Wood
2023-02-05 3:46 ` [PATCH 2/2] diff: teach diff to read gitattribute diff-algorithm John Cai via GitGitGadget
2023-02-05 17:50 ` Eric Sunshine
2023-02-06 13:10 ` John Cai [this message]
2023-02-06 16:27 ` Phillip Wood
2023-02-06 18:14 ` Eric Sunshine
2023-02-06 19:50 ` John Cai
2023-02-09 8:26 ` Elijah Newren
2023-02-09 10:31 ` "bad" diffs (was: [PATCH 2/2] diff: teach diff to read gitattribute diff-algorithm) Ævar Arnfjörð Bjarmason
2023-02-09 16:37 ` [PATCH 2/2] diff: teach diff to read gitattribute diff-algorithm John Cai
2023-02-06 16:39 ` Ævar Arnfjörð Bjarmason
2023-02-06 20:37 ` John Cai
2023-02-07 14:55 ` Phillip Wood
2023-02-07 17:00 ` John Cai
2023-02-09 9:09 ` Elijah Newren
2023-02-09 14:44 ` Phillip Wood
2023-02-10 9:57 ` Elijah Newren
2023-02-11 17:39 ` Phillip Wood
2023-02-11 1:59 ` Jeff King
2023-02-15 2:35 ` Elijah Newren
2023-02-15 4:21 ` Jeff King
2023-02-15 5:20 ` Junio C Hamano
2023-02-15 14:44 ` Phillip Wood
2023-02-15 15:00 ` Jeff King
2023-02-07 17:27 ` Ævar Arnfjörð Bjarmason
2023-02-15 14:47 ` Phillip Wood
2023-02-09 8:44 ` Elijah Newren
2023-02-14 21:16 ` John Cai
2023-02-15 3:41 ` Elijah Newren
2023-02-09 7:50 ` Elijah Newren
2023-02-09 9:41 ` Ævar Arnfjörð Bjarmason
2023-02-11 2:04 ` Jeff King
2023-02-07 17:56 ` Jeff King
2023-02-07 20:18 ` Ævar Arnfjörð Bjarmason
2023-02-07 20:47 ` Junio C Hamano
2023-02-07 21:05 ` Ævar Arnfjörð Bjarmason
2023-02-07 21:28 ` Junio C Hamano
2023-02-07 21:44 ` Ævar Arnfjörð Bjarmason
2023-02-09 16:34 ` John Cai
2023-02-11 1:39 ` Jeff King
2023-02-14 21:40 ` [PATCH v2 0/2] Teach diff to honor diff algorithms set through git attributes John Cai via GitGitGadget
2023-02-14 21:40 ` [PATCH v2 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-15 2:38 ` Junio C Hamano
2023-02-15 23:34 ` John Cai
2023-02-15 23:42 ` Junio C Hamano
2023-02-16 2:14 ` Jeff King
2023-02-16 2:57 ` Junio C Hamano
2023-02-16 20:34 ` John Cai
2023-02-14 21:40 ` [PATCH v2 2/2] diff: teach diff to read gitattribute diff-algorithm John Cai via GitGitGadget
2023-02-15 2:56 ` Junio C Hamano
2023-02-15 3:20 ` Junio C Hamano
2023-02-16 20:37 ` John Cai
2023-02-17 20:21 ` [PATCH v3 0/2] Teach diff to honor diff algorithms set through git attributes John Cai via GitGitGadget
2023-02-17 20:21 ` [PATCH v3 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-17 21:27 ` Junio C Hamano
2023-02-18 1:36 ` Elijah Newren
2023-02-17 20:21 ` [PATCH v3 2/2] diff: teach diff to read algorithm from diff driver John Cai via GitGitGadget
2023-02-17 21:50 ` Junio C Hamano
2023-02-18 2:56 ` Elijah Newren
2023-02-20 15:32 ` John Cai
2023-02-20 16:21 ` Elijah Newren
2023-02-20 16:49 ` John Cai
2023-02-20 17:32 ` Elijah Newren
2023-02-20 20:53 ` John Cai
2023-02-22 19:47 ` Jeff King
2023-02-24 17:44 ` John Cai
2023-02-18 1:16 ` [PATCH v3 0/2] Teach diff to honor diff algorithms set through git attributes Elijah Newren
2023-02-20 13:37 ` John Cai
2023-02-20 21:04 ` [PATCH v4 " John Cai via GitGitGadget
2023-02-20 21:04 ` [PATCH v4 1/2] diff: consolidate diff algorithm option parsing John Cai via GitGitGadget
2023-02-20 21:04 ` [PATCH v4 2/2] diff: teach diff to read algorithm from diff driver John Cai via GitGitGadget
2023-02-21 17:34 ` [PATCH v4 0/2] Teach diff to honor diff algorithms set through git attributes Junio C Hamano
2023-02-21 18:05 ` Elijah Newren
2023-02-21 18:51 ` Junio C Hamano
2023-02-21 19:36 ` John Cai
2023-02-21 20:16 ` Elijah Newren
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